If coming by car (rental car).
Access method 1: From Fukuoka.
Take the Oita Expressway from Tosu JCT,
head towards Oita -> Hita IC -> National Route 212 towards Aso,
and from Oguni-machi take National Route 442 towards Kurokawa.
Access method 2: From Kumamoto IC.
Take the Kyushu Expressway towards Kumamoto -> Kumamoto IC -> National Route 57 towards Aso,
and from Aso Station take Route 212 towards Hita.
Parking: Available (free).
*Roads may freeze in winter, so chains or winter tires may be required.